// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_CLIENT_FOCUS_CHANGE_OBSERVER_H_
#define UI_AURA_CLIENT_FOCUS_CHANGE_OBSERVER_H_

#include "ui/aura/aura_export.h"

namespace aura {
class Window;
namespace client {

    // TODO(beng): this interface will be OBSOLETE by FocusChangeEvent.
    class AURA_EXPORT FocusChangeObserver {
    public:
        // Called when focus moves from |lost_focus| to |gained_focus|.
        virtual void OnWindowFocused(Window* gained_focus, Window* lost_focus) = 0;

    protected:
        virtual ~FocusChangeObserver() { }
    };

    AURA_EXPORT FocusChangeObserver* GetFocusChangeObserver(Window* window);
    AURA_EXPORT void SetFocusChangeObserver(
        Window* window,
        FocusChangeObserver* focus_change_observer);

} // namespace client
} // namespace aura

#endif // UI_AURA_CLIENT_FOCUS_CHANGE_OBSERVER_H_
